题目内容
计算:75×4.7+15.9×25=
750
750
.分析:把15.9写成5.3乘3,先算3乘25得75,再用乘法分配律进行简算.
解答:解:75×4.7+15.9×25,
=75×4.7+5.3×(3×25),
=75×(4.7+5.3),
=75×10,
=750;
故答案为:750.
=75×4.7+5.3×(3×25),
=75×(4.7+5.3),
=75×10,
=750;
故答案为:750.
点评:此题考查小数的巧算,把原来的算式创造出能用运算定律简算的形式,进一步用运算定律简算.
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